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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '341e2a9c5b07efbe4c3234f5c2eca159d4bd1a2f6b7925fd37dae3d3da93a1b1' 
  AND token = 'q+bao2amNEwUe2N4ONz4W07FNf5ibJfAf5sNabJjjzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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