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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947acfd1d63fbbbe826f0b228714c2cbc48ba02b3a18a700ec7f6aea28b628fa' 
  AND token = 'Tm60vV6CcWZt7PE9TYlmVUWFQ3tHnbI04TJ5DYE50DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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