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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a99301c9fa77b1f2e661f8d8fd492f98f83bf30b665065282700c80cacd0de' 
  AND token = 'joc7OlKMIRhJvMGJ65mtqe7/9y6K0mNDSwT0ip9DBv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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