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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b176531ce704672f189463aa7f80c21edae09b8076e020972de4a7adacc6d6fd' 
  AND token = 'bGJV0+5OGfzG7Y9iJP4wH1gjn9Hbg8KFAyd4f7vnUE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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