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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c05f903a94e3e9729e47cd64ae477ba8a20cd53a3f4ba4b4fafa6ea0b2a004b' 
  AND token = 'd7Vwq97SLxpHFt7iXcGtyxzI8a15eH+nzcJQ12/rn5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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