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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266f03f20daf7950f83ecf67113b093f5dbac94b0cea106e3c96b7cded2e449f' 
  AND token = 'CqMnUMO3wz3PUBT9gRd7G7se73Vxe4/5kpdYyvPnm1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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