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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6ae91a1bcb570e95e576ef052b78de412396b2c81426da5996fd61f905c8d6' 
  AND token = 'XZy1peaCQdsEx0zu0IpSa7RE1DPtuv3fjbIN5J07NXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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