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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401016da87774201df5ae1336cfee21fff096c9d548cc881f2b7cec44db2ed71' 
  AND token = '6WAZ1qjlTEMU4hgZ1bXxFahuGA2YEiBf/HgBQCnT0GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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