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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1319acd07f47c1c69ab52718e087402b4a60a85f9f7cd1d0699fe20725eda002' 
  AND token = 'kmD7mwpMNZlWNF+lfljFOYwN3Si2lBoMM9lzatkVuqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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