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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b9135284989671a4508ab5da9208601327fe5e6050741a366e4304ccdfdec1' 
  AND token = 'vopAz0sAPh4WL6KxcQI7QavrO5soxX8O/CBX1NRFTTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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