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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9fa70aec748981352089dd2897d00ea12bd2d46652e7ccbe4823107bf4fc9f4' 
  AND token = '86VoT+y7+gKplWC3Mn1FZ5wODINDerQqeJW2okshLvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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