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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d8deedec6cf1fad7ee869cd69827ef3c7f2c93dfd1a78b89925066043fe864' 
  AND token = 'ZvlnSeyUMPmHhmklMH+94XjoLxWXpUZ3ZwjPnge4M6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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