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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93295e045a6329f400b9acef7be03c76ba537322a846f5f91307226ceb1fe772' 
  AND token = '5v519OaaER0R+x+jqrxJFvTAOAYVMeA2a1KYBqnfbjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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