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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b3f2b3a2c447b308c5128c463203d720af9468589bbd9d3f91d336b061564f' 
  AND token = 'nlKUODEeByzi566dgSyjUZFRhE/Ngd4ym5Jw6MO5D+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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