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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4df61358a827b7354b32ca55c86df9c75bfca8ad9d289de21d94c9a20976a13' 
  AND token = 'NHMO2fMn8e0Gxy5gEFeuKxsE/UyPfJKUz4ndc08lE2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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