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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc593d629eae876eff3bc7f5fd39d254f76f32e119650be6468917b2c5f8606' 
  AND token = 'RTFt0Na8X/cu6Iu3cZzlt9iIM2KSIssTtOyvcjopxCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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