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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02189eb75192cfd19338e2246f03759cbe8681837aea820cccf54a18a4cc2ac7' 
  AND token = 'bMOGlITEfXe46iYP6JgjFhHIYGZyhVkYs7ayCumJ6Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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