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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae803f85cff44e0b3f0ccf8586bc42e79b7c6a96b2cb1c53985f9b5245fdeb53' 
  AND token = '96H2MTD/LrVEoxbuBaUF3Od1krAVL5BsKtxtYJ5lcZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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