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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fc0eb81ac05ee2fdafa04aa1bea50612d3c3b9be6685e926dbba7b8b70cd53' 
  AND token = 'ENEUILVliymQebwUmnc8O38mjgM5CwRyInC73HVlEwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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