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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e002c6316c1ead352b08efc50bdf230ffc19b42ba356c75d2e23b7aeb07834' 
  AND token = '5AGvp9A6Lr/HMkL/3VApH07lqgHhtuK5dUEcYOjCcmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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