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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c89ff092cfacd72974710eb93716e4e2177d0dad9d51f37024eb2d1096d783' 
  AND token = 'raKTicdUPMAplww2sd0xlNweSJzjboYfad7M2e/t9b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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