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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4eb32d7d8b1824bacd92f9eb966b017d1781b49af5afb20fc5a823d4d9cf10a' 
  AND token = 'GZFabVUs2SpzMfg4/Vr9aajVRuwc8aVMNWOJ7o3Dsm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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