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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e5c514200b2c49e28bd26bb02668a86580a1831fbb55c3086619a494e69cb2' 
  AND token = 'zk6HOZQxjDUw+xkLqYen5d5L+9xfVdIWmHC2oZ1Hkz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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