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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df90aeb53bbf26f38f64b56a7fbfa8641563f3fd83685299604d6733e737d5fa' 
  AND token = 'F+ihwm+3KgY4YUuga5ysfukYM7N435JxNgYING7nDDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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