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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984570848d7a98ba5757b220c16b80c1b2c25a470292a226e62038bf303d02b4' 
  AND token = 'ejXcLjL+05vf5ryXJNHaBmMrGntmMzL2yLrKo6PyN+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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