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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d8ccdaa1b3fc4b5305e6a4b9097fd283b0f3c66a53ed67b49fef33ff39364c' 
  AND token = 'noy/gxzkZ9Xh8W26FsTAB/DuDAkHyqBMOHbTAv/wT6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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