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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912351319150478d0b3415e25c2bfe2ed29ba9e3caa599d87db3f70007a61016' 
  AND token = 'aOYTMxNTp1LbMdGn8Ky/rU7/G1Bm8AzuyBTnHb6Y6oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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