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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197b5c37e3e4301143baa36066246324655096ec00392e1ce5bcd713d93376f6' 
  AND token = 'tx89AbsU4d+86XQT+/Sy0yJDmVWhN+UtrDb9U3a29uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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