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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03637cd436e639423efee2c916b5d7bc9dbe45cda09804c983d34239d0d5dd9' 
  AND token = 'k5v/aBe8rtXmKv6m9edelStJK3ggLxKYR2mI0EsxPaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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