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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc701c6397161919a560683a596e326402fc3aa43eab323f9644c5c5dafbbc4' 
  AND token = '3I41YsnRtk4nNaEKV/QCtx6H+P+Pe/cvGHzC7NfjOlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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