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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba0c74d4c057953d14c090dcc42a1e7d70dc1f55788e7b3f6b1173237f712c4' 
  AND token = 'M6cH9gDcCQEmfKokfDBxbSdE9O1sk9nmO1IBr1AMkWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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