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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78f79e95ed25e1781af41f4cce823c9469278e47a64fa58f56af5273e43f520b' 
  AND token = 'kT+mo4dp4vM4kI3hqzd7uPiGYUlI+3v8ml8Ivghvj8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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