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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f709f740f5a7cc8e62e18899e79effb890a5c5100bbdd048bbbedba376a690' 
  AND token = '4ZDFFJAoD6yFnab9qdYxImNfA2AZYU2i7QNN5uVaxsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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