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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fcb57518ffd7e5f1797782fdfd1a29febd7ba83866ecb6815e0a013420d92bb' 
  AND token = 'KAjTLZkaBY4yfl58t8GTDw1VD+bX67xOvdJOkAKae6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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