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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d513666dac2c84da83617124f2ff2522f70b91ede9ce186e796f4cbf8dd3e00' 
  AND token = 'eeSUh19i3sF3t0EYObkj7bPcXAHDJrh2nai6Z/Ap/+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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