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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab760fc38b955c6047fc5a5d655634287a2afc9f23fdd06e2683e09eb96fd0ce' 
  AND token = 'fHWGA7Awm01qkI4AU31NPTEbOtBmzW95bu8Q4j4KcTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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