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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f14e4485d2b61f5b0763f5f19f0a197120eb15ec53c2c4872a4b5d546d839c' 
  AND token = 'RoCjjg6ZLbP6esjx0OoUperCqsBGG/ouvGbkvXv6308=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}