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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959661d83dff3539de45969d47e733a2c544ea2edadca2fea013cef35e906f7e' 
  AND token = 'mHLHJLIdoDCj8La//4/cDckbg71yZD/g4SMSR2PJ8bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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