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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be32ca90b0f87360f18197681134da3d827e6288feca7eefdb93bdc36db0b7d' 
  AND token = 'qwanfVwo6BiYzlbP5Rc1iZ7jMwu/GzwC22bv2rL4nhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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