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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ee45662a44c0014d77c842491cbd9a05dd7717f1a3a6c2e550b8b5044a817d' 
  AND token = 'ix6T4IwlwkD1e4Ll9zfjrw0PDIEg5Xdg6HCRQD0Qeyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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