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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6efcb4d9e06f1bc64e0d35af84b2be9420ccbadde67d68733ec08fba1addf3b' 
  AND token = 'SWyQnrHExDvh4vF41RuCmb/h0CuLXHaj7jhDFSOclOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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