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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b99bb3a2bd0c2962cb49dbe12e71005dfeddecb8e5958e07d5d3575166284d' 
  AND token = 'jTWU7oxNbu6lJz9p/7GdO+o/cNOnJ0sSmzmY7yOtnrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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