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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f195f11900277adba626ba31ca51e81218f7d5833be3e70bcbefa9ed779f3fc2' 
  AND token = 'kR3l53Cc9nG+BpJB53rJHYK2Z7mIC0qE7zmnQFNAmew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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