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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33f385a7cbfc21707f21d6cd2dbc80fe4729baeb163a9abbeb4eb866f0c2fcd' 
  AND token = 'hKX7FxBEwOq7/nA5jKSOBH+Q0rXNnEl9uudTsRoNtAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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