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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672c3996dda88073e8dcc9ae3e6db3ae166894753033cb0896f2a424c6995f57' 
  AND token = '1lwVLhSpiW4/I4DIlRvb+RD1DGM5hRM8/LASbKxGC2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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