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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f37625de4338209034c16265b891905510241d5d3fa988e5d2f0be26077df3' 
  AND token = 'YSesOGeJVML4Z3DO6R7K/EmaJS+2Oi4So65m04zig3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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