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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aef5d77a653a5bec60e4e47e3237e74da72d81a202642ebf8800f9ca0cc66a4' 
  AND token = 'iPWb52645TQUzGl2Hfl/dpvzo61q6n5TUXoHP91FKnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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