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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ec899ac0aef8c56033159133aede614ec627c7e4bfe990d8b2e544b37de804' 
  AND token = 'UvuI1scu0F7yqLqNdcg9TY+NsjnvUCzuh+qRs2E2bBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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