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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9a6ca71021de132c12e29d90647959b6179427c5084be6803d0c4712942c87' 
  AND token = 'wY4h3LKyBHt54MBCW9WCNRyJxEkSegKxWrlIpnbco0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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