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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f0a1542ce052e0c3eddb5ed3c2ac231cbf923e182e8ca40aa954d9514f3004' 
  AND token = 'BgoUUeu5f+gno+8/grQA2lZ98SAbMxIzdK+j23L7OkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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