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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc472e61b7e5b337bfadc8e23a356c017f6f67e0f2627b3447c750eb29fd1e4' 
  AND token = 'FYoibOUc4gs26u3lclyAhDdDksevCYdmMcG9hUh4dZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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