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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b6241766fcff63c07537ac56d464b9f879b1e638fed076518aeaf02c54fdd76' 
  AND token = 'Kv11r5eyurr+yZGQFeIumYd49S3IYUtRsVtGu3Jh4f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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