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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8812355c22f5fbb3c93638b7194c6b964cf5c9f6c7c57fb6cb16b04844fe37ac' 
  AND token = 'GYEyi4iBoLi2vZ2wf785CyIyDmtqFl+iibVHW9p4y2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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