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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923b3dabb84f9cdb7f58a7cc8ab2724727ff1b3c7bc03bd3e6d96d8033f9726a' 
  AND token = 'x+gMeEwMPxmuoM6b8/ffzbctU0N3Cm7zBXtn5O2bmKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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