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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c309d2c4db96d81ce7a5c689eccd64a9c986d206085e0ac14a7d7f04afcdd2a' 
  AND token = 'XlJMGVWEes113d3PmYzKHOA5DNTLeFd0McsCxPNtCDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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