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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9c740d346bdb5c1dc63840123da293ec5a05c819589935d91d4f2accce1d2a' 
  AND token = 'sRF+PTGhl34DMU+ycs7wSwQEZf6KHDF8q1uQkM2OtxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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