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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071f6785dd2a4687e8c25e86ed483eea846d14f68ab2244df229f1eb2c397534' 
  AND token = 'd5xSOjE/Eag1Rcz+wmzLhDQcs1BPIiIhXawzmjQXWSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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