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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ee1d0bc19c087ae207afe10cc2dc16d05d475ddc7cb7f603843b5521ae3487' 
  AND token = 'N9iPR25KBBasgfc41zk0GkUFLXyj40TskJmqHG5Z/9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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