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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0636da500af99b7648585bed988f8ef469141dc459602ff9368007c9fa97993' 
  AND token = '63u7EK2ripF0eBEdhsIrKhddMl9kZecWkIA/Gj/k7ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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